Compression Fixture for Solid-State Coin Cell (CR20XX) Test, CSSCCTCF
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When testing all-solid-state batteries (SSBs) in a coin cell format, standard internal wave springs are entirely inadequate. Solid-state systems require significantly higher, well-controlled external mechanical pressure—typically between 5 MPa and 15 MPa (and sometimes up to 30+ MPa for processing or high-rate cycling)—to maintain intimate solid-to-solid contact and prevent interfacial void formation during lithium stripping.
The primary functions of the compression fixture are shown below: (1) Suppressing Volume Expansion: Anodes containing silicon or alloy materials undergo substantial volumetric change during lithiation. The compression fixture provides an external clamping force to prevent structural pulverization and layer delamination. (2) Preventing Interfacial Voids: In solid-state battery testing, high stack pressure (often 5 MPa to 15 MPa) is mandatory to maintain intimate solid-to-solid contact at the electrode/electrolyte interface, compensating for material creep during stripping and plating. (3) Eliminating Contact Resistance: By applying a calibrated mechanical load, the fixture ensures stable, reproducible 4-wire (Kelvin) electrical contact, driving down parasitic Area Specific Resistance (ASR) to reveal true intrinsic material performance.
| Part Number |
CSSCCTCF (C-SSCCT-CF) |
| Locating Slot |
D=20 mm (suitable for CR20XX coin cells, such as 2016, 2025, 2032)
|
| Material |
SS304 body + PTFE insulating pad |
| Compression Pressure |
Max. 800 MPa (normally 300 MPa for solid-state coin cell test) |
| Assembling Flow Chart |
 |
| Product Size | 60mm*30mm |
References:
- Y. Zhou, et al., External pressure: An overlooked metric in evaluating next-generation battery performance, Current Opinion in Electrochemistry, 2022, 31, 100916.
- C. Soulen, et al., Bridging the Gap Between Pouch and Coin Cell Electrochemical Performance in Lithium Metal Batteries, J. Electrochem. Soc., 2024, 171, 020535
- P. Xu, et al., Reducing External Pressure Demands in Solid-State Lithium Metal Batteries: Multi-Scale Strategies and Future Pathways, Adv. Energy Mater., 2026, 16, e04613